Fundamentals Of Thermodynamics
10th Edition
ISBN: 9781119494966
Author: Borgnakke, C. (claus), Sonntag, Richard Edwin, Author.
Publisher: Wiley,
expand_more
expand_more
format_list_bulleted
Concept explainers
Videos
Textbook Question
Chapter 5, Problem 5.64P
A house is cooled by a heat pump driven by an electric motor using the inside as the low−temperature reservoir. The house grains energy in direct proportion to the temperature difference as
Figure P5.64
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
3.16 The store advertisement claims that a new light bulb type consumes
only 9 W to generate the same visible light as an old 40-W light bulb.
The advertised saving in electric power consumption is 31 W. The objec-
tive of this problem is to question this advertisement. Assume that the
light bulb is on inside a building of temperature Tg = 20°C, while the
35°C. A heat pump removes the heat
atmospheric temperature is TA
current generated by the light bulb (Q) and rejects it to the ambient.
The heat pump power required to do this is WHp. The Q/WHP ratio of
the heat pump is one-fifth of what it would be in the limit of reversible
operation.
(a) Determine the Q/WHp ratio in the reversible limit and in the actual
heat pump design.
(b) Calculate the heat pump power WHp required to evacuate Q from the
old light bulb and the new light bulb.
(c) Calculate and compare the total power dissipated because of the old
light bulb and the new light bulb. The total power of one light bulb is
the sum of…
An electric storage battery which can exchange heat only with a constant temperature atmosphere goes through a complete cycle of two processes. In process 1-2, 2.8 kWh of electrical work flow into the battery while 732 kJ of heat flow out to the atmosphere. During process 2-1, 2.4 kWh of work flow out of the battery. (a) Find the heat transfer in process 2-1. (b) If the process 1-2 has occurred as above, does the first law or the second law limit the maximum possible work of process 2-1? What is the maximum possible work? (c) If the maximum possible work were obtained in process 2-1, what will be the heat transfer in the process?
2. I just need the graph of this. A certain ideal gas (unknown) inside a close piston-cylinder assembly undergoes a set of processes
that composed of Isothermal expansion from State point 1 to state point 2, Isometric heat rejection
from state point 2 to state point 3, and Isentropic compression from state point 3 back to the initial
condition. If the maximum pressure is 3000kPa and maximum and minimum volume is 200cm3
and
50cm3
Chapter 5 Solutions
Fundamentals Of Thermodynamics
Ch. 5 - Prob. 5.1PCh. 5 - A windowmounted air conditioner removes 3.5kJ from...Ch. 5 - R410A enters the evaporator (the cold beat...Ch. 5 - A large heat pump should upgrade 4MW of heat at...Ch. 5 - A car engine 5g/s fuel (equivalent to addition of...Ch. 5 - Prob. 5.37PCh. 5 - R134a fills a 0.1m3 capsule at 20°C, 200kPa. It is...Ch. 5 - Air in a piston/ cylinder goes through a Carnot...Ch. 5 - A heat engine receives 7kW from a 300°C source and...Ch. 5 - Consider the previous problem and assume the...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 1. please provide me a complete solutions with step by step procedure. thank you!arrow_forwardI need the answer quicklyarrow_forward3.15 The heating rate that a heat pump delivers to a living space of tempera- ture 20°C is 5 kW. The coefficient of performance of the heat pump is COP = 2. The temperature of the ambient is 0°C. (a) What is the electrical power required by the heat pump? (b) What is the rate at which the heat pump draws heat from the ambient? (c) What is the highest COP value that the heat pump may attain? (d) Is the operation of this heat pump violating the second law of thermodynamics?arrow_forward
- M: Constarm h=chang Q2. Heat cannot be zero in closed system (True/False). ( F cee Q1. Work cannot be zero in closed system (True/False) Q3. First law of thermodynamics is not based on the law of conservation of energy (True/False), Q4. The change in the total energy of the closed system is -Q5. The sum of the'energiesCarried by the mass in open system is.Mashalase Emi =Eme Q-w=AH fluichProleabie.haT ehange with Time Q6. The general form of first law of thermodynamics for open system.. Q7. Un steady state flow process is defined as. internal+ Q8. Enthalpy is defined sum of kinetic and flow energy (True False), 09. Cyclic process is defined as.wha.h.ystem start from initial state trour, L diffrent Processes and .e.k... Q10. Internal energy is considered in open system (True/False)İarrow_forward3arrow_forwardQ A horizontal piston-cylinder assembly contains 2.00 kg of a fluid. The assembly is fitted with both a heater and a paddle wheel. It is found that the fluid undergoes an expansion from state 1 to state 2. During the process, the paddle wheel transmits 16.4 kJ of mechanical energy (Wp.w.) to the fluid via mixing, and the heater supplies 83 kJ of thermal energy (Q) to the fluid. The specific internal energy changes from U1 = 2386.6 kJ/kg to U2 = 2409.1 kJ/kg during the process. Determine the work done by the steam on the piston during the process (Wpiston) (kJ). Your Answer: 45°F hp Insert * 24 % 8. 4 R H J K D F CV B N Marrow_forward
- A gas undergoes a constant pressure process at P = 2.5 kPa where the volume increases from 500 | to 1500 I. Determine the change in internal energy if 3000 J of heat is transferred to the system. Select one: a. 500 kJ b. 55 J c. 500 Jarrow_forwardPlease consider an electric motor (the system) in steady operation in an environment with T = 24 •C. The motor draws 1 kW of electrical power and produces 1 hp of mechanical horse power. a. Please determine Q in Wat. b. Please determine Šc in Watt/ K. 1.arrow_forwardIn a quasi-static isobaric expansion, 540 J of work are done by the gas. The gas pressure is 0.90 atm and it was originally at 15.0 L. If the internal energy of the gas increased by 70 J in the expansion, how much heat (in J) does the gas absorb?arrow_forward
- Send correct answerarrow_forwardA closed system loses energy by heat transfer at the rate of 10kJ/s. Write the energy balance for this problem if the system operates at steady statearrow_forward1. Water in the rural areas is often extracted from underground water source whose free surface is 60 m below ground level. The water is to be raised 5 m above the ground by a pump. The diameter of the pipe is 10 cm at the inlet and 15 cm at the exit. Neglecting any heat interaction with the surroundings and fictional heating effects. What is the necessary power input to the pump in kW for a steady flow of water at the rate of 15 li/s? Assume pump efficiency of 74%.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
Principles of Heat Transfer (Activate Learning wi...
Mechanical Engineering
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Cengage Learning
Heat Transfer [Conduction, Convection, and Radiation]; Author: Mike Sammartano;https://www.youtube.com/watch?v=kNZi12OV9Xc;License: Standard youtube license